On Tue, Nov 07, 2017 at 12:26:12PM +0100, Florian Weimer wrote: > On 11/07/2017 12:15 PM, Kirill A. Shutemov wrote: > > > > First of all, using addr and MAP_FIXED to develop our heuristic can > > > never really give unchanged ABI. It's an in-band signal. brk() is a > > > good example that steadily keeps incrementing address, so depending > > > on malloc usage and address space randomization, you will get a brk() > > > that ends exactly at 128T, then the next one will be > > > > DEFAULT_MAP_WINDOW, and it will switch you to 56 bit address space. > > > > No, it won't. You will hit stack first. > > That's not actually true on POWER in some cases. See the process maps I > posted here: > > <https://marc.info/?l=linuxppc-embedded&m=150988538106263&w=2> Hm? I see that in all three cases the [stack] is the last mapping. Do I miss something? -- Kirill A. Shutemov
